I found this post` but can this done with an RPM or RBI ? If it can you could maybe mix a clean sound with a dirty sound if you have a Stereo amp. According to Lloyd Schwartz at Tech21, the SansAmp can be modded so that its XLR output can put out up to +4 dBu, which is enough to drive a PLX 2402 to full power. Here's what he wrote : When you remove the back cover of the Bass Driver, you'll see a "black box". Just to the right of its lower right corner, there's a resistor surrounded by two arrows. It looks like this: >O< (except it's square) Remove it, and you're done! BTW, the resistor is an SMT type (a small black rectangular shape]. Well, a larger signal is a boost in volume. I don't know for sure if it'll affect tone, but probably not. Has anybody modded an RPM or RBI so the XLR puts +4db ??